I was actually shocked with the sudden change from Google keyword tool to the google keyword planner. I didn't like the update at first, but then liked it later. It makes me filter my research faster with the keys I want to find. You need to log in to be able to use the tool compared before.
With finding keys, I make sure that people are searching for that keys. I prioritize longer keys than the shorter ones. Also, I make sure that the keys are related to what my site is all about and what I am trying to promote.